﻿using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace JZ_UDI.CommonHelper
{

    /// <summary>
	/// config操作类
	/// </summary>
    public static class ConfigHelper
    {

        //依据连接串名字connectionName返回数据连接字符串 
        public static string GetConnectionStringsConfig(string connectionName)
        {
            //指定config文件读取
            string file =AppDomain.CurrentDomain.BaseDirectory;
            Configuration config = ConfigurationManager.OpenExeConfiguration(file);
            string connectionString = config.ConnectionStrings.ConnectionStrings[connectionName].ConnectionString.ToString();
            return connectionString;
        }

        ///<summary> 
        ///更新连接字符串 
        ///</summary> 
        ///<param name="newName">连接字符串名称</param> 
        ///<param name="newConString">连接字符串内容</param> 
        ///<param name="newProviderName">数据提供程序名称</param> 
        public static void UpdateConnectionStringsConfig(string newName, string newConString, string newProviderName)
        {
            //指定config文件读取
            string file = AppDomain.CurrentDomain.BaseDirectory;
            Configuration config = ConfigurationManager.OpenExeConfiguration(file);

            bool exist = false; //记录该连接串是否已经存在 
            //如果要更改的连接串已经存在 
            if (config.ConnectionStrings.ConnectionStrings[newName] != null)
            {
                exist = true;
            }
            // 如果连接串已存在，首先删除它 
            if (exist)
            {
                config.ConnectionStrings.ConnectionStrings.Remove(newName);
            }
            //新建一个连接字符串实例 
            ConnectionStringSettings mySettings =
              new ConnectionStringSettings(newName, newConString, newProviderName);
            // 将新的连接串添加到配置文件中. 
            config.ConnectionStrings.ConnectionStrings.Add(mySettings);
            // 保存对配置文件所作的更改 
            config.Save(ConfigurationSaveMode.Modified);
            // 强制重新载入配置文件的ConnectionStrings配置节 
            ConfigurationManager.RefreshSection("ConnectionStrings");
        }

        ///<summary> 
        ///返回*.exe.config文件中appSettings配置节的value项 
        ///</summary> 
        ///<param name="strKey"></param> 
        ///<returns></returns> 
        public static string GetAppConfig(string strKey)
        {
            try
            {
                //string file = AppDomain.CurrentDomain.BaseDirectory;
                Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                foreach (string key in config.AppSettings.Settings.AllKeys)
                {
                    if (key == strKey)
                    {
                        return config.AppSettings.Settings[strKey].Value.ToString();
                    }
                }
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
            return null;
        }

        ///<summary> 
        ///在*.exe.config文件中appSettings配置节增加一对键值对 
        ///</summary> 
        ///<param name="newKey"></param> 
        ///<param name="newValue"></param> 
        public static void UpdateAppConfig(string newKey, string newValue)
        {
            string file = AppDomain.CurrentDomain.BaseDirectory;
            Configuration config = ConfigurationManager.OpenExeConfiguration(file);
            bool exist = false;
            foreach (string key in config.AppSettings.Settings.AllKeys)
            {
                if (key == newKey)
                {
                    exist = true;
                }
            }
            if (exist)
            {
                config.AppSettings.Settings.Remove(newKey);
            }
            config.AppSettings.Settings.Add(newKey, newValue);
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("appSettings");
        }

    }
}
